Changes after review

Author: andreyvelich

docs/source/developers/architecture.rst

@@ -8,13 +8,13 @@ This information is useful for developers who want to understand how Jupyter
 Server components are connected and how the principal workflows look like.
 
 To make changes for these diagrams, use `the Draw.io <https://app.diagrams.net/>`_
-open source tool.
+open source tool to edit the png file.
 
 
 Jupyter Server Architecture
 ---------------------------
 
-The Jupyter Server system can be seen in figure bellow:
+The Jupyter Server system can be seen in figure below:
 
 .. image:: ../images/jupyter-server-architecture.drawio.png
    :alt: Jupyter Server Architecture
@@ -31,32 +31,43 @@ Jupyter Server contains the following components:
   SererApp settings. Follow :ref:`the Config File Guide <other-full-config>` to
   learn about configuration settings and how to build custom config.
 
-- **Custom Extensions** allow to create the custom Server's REST API endpoint.
+- **Custom Extensions** allow you to create the custom Server's REST API endpoints.
   Follow :ref:`the Extension Guide <extensions>` to know more about extending
   ServerApp with extra request handlers.
 
-- **Kernel Gateway** is the web server that provides access to Jupyter Kernels.
-  There are different ways to create this gateway. If your ServerApp needs to
-  communicate with remote Kernels, you can use
-  `the Enterprise Gateway <https://github.com/jupyter-server/enterprise_gateway>`_,
-  otherwise you can use `the Kernel Gateway <https://github.com/jupyter-server/kernel_gateway>`_.
+- **Gateway Server** is a web server that, when configured, provides access to
+  Jupyter Kernels running on other hosts. There are different ways to create a
+  gateway server. If your ServerApp needs to communicate with remote Kernels
+  residing within resource-managed clusters, you can use
+  `Enterprise Gateway <https://github.com/jupyter-server/enterprise_gateway>`_,
+  otherwise, you can use
+  `Kernel Gateway <https://github.com/jupyter-server/kernel_gateway>`_, where
+  Kernels run locally to the gateway server.
 
 - **Contents Manager and File Contents Manager** are responsible for serving
   Notebook on the file system. Session Manager uses Contents Manager to receive
   Kernel path. Follow :ref:`the Contents API guide <contents_api>` to learn
   about Contents Manager.
 
-- **Session Manager** processes users Sessions. When user starts a new Kernel,
+- **Session Manager** processes users' Sessions. When a user starts a new Kernel,
   Session Manager starts a process to provision Kernel for the user and generates
   a new Session ID. Each opened Notebook has a separate Session, but different
-  Notebook Kernels can use the same Session. That is useful if user wants to
+  Notebook Kernels can use the same Session. That is useful if the user wants to
   share data across various opened Notebooks. Session Manager uses SQLite3
-  DataBase to store the Sessions.
+  DataBase to store the Session information. The database is stored in memory by
+  default, but can be configured to save to disk.
 
-- **Mapping Kernel Manager** is responsible to operate multiple Kernels in the
-  ServerApp. It starts a new Kernel for a user's Session and generates a
-  new Kernel ID.
+- **Mapping Kernel Manager** is responsible for managing the lifecycles of the
+  Kernels running within the ServerApp. It starts a new Kernel for a user's Session
+  and facilitates interrupt, restart, and shutdown operations against the Kernel.
 
-- **Kernel Spec Manager** parses file with JSON specification for a Kernel.
-  To know more about Kernel Spec, follow
-  `the Jupyter Client guide <https://jupyter-client.readthedocs.io/en/stable/kernels.html#kernel-specs>`_.
+- **Jupyter Client** library is used by Jupyter Server to work with the Notebook
+  Kernels.
+
+  - **Kernel Manager** manages a single Kernel for the Notebook. To know more about
+    Kernel Manager, follow
+    `the Jupyter Client APIs documentation <https://jupyter-client.readthedocs.io/en/latest/api/manager.html#jupyter_client.KernelManager>`_.
+
+  - **Kernel Spec Manager** parses files with JSON specification for a Kernels,
+    and provides a list of available Kernel configurations. To learn about
+    Kernel Spec, check `the Jupyter Client guide <https://jupyter-client.readthedocs.io/en/stable/kernels.html#kernel-specs>`_.